involving the mind or an intellectual process
to exert much effort or energy
(physics) deformation of a physical body under the action of applied forces
a succession of notes forming a distinctive sequence
use to the utmost; exert vigorously or to full capacity
difficulty that causes worry or emotional tension
a special variety of domesticated animals within a species
(psychology) nervousness resulting from mental stress
(biology) a group of organisms within a species that differ in trivial ways from similar groups
